Giggs claims Ronaldo move motivated by Messi obsession

But while the club and the auto company are separate corporate entities, individually managing their own operations and finances, the Italian USB Lavoro Privato union considers it "unacceptable" that such a large investment has gone into securing Ronaldo from the Galacticos.

"It's unacceptable that, while FCA and CNHI workers continue to make huge economic sacrifices, the company spends hundreds of millions of euros on the purchase of a player", union USB Lavoro Privato said in a statement.

As reported by the BBC, workers at the FiatChrysler's Melfi plant in southern Italy are set to strike as a result of the deal.

Both Juventus and Fiat are controlled by the Agnelli family through their holding company but for the USB (Unione Sindacale di Base) union, it means Fiat will be missing out on investment for it's workers.

Serie A champions Juventus acquired Ronaldo, the World Cup captain of Portugal's national team, from Real Madrid in one of the most expensive transfer deals of all time. "Zidane or no Zidane, the white jersey of Madrid is special".

He leaves as Los Blancos' all-time top scorer and a four-time Champions League victor with the team he joined in 2009.

"We're all employees of the same owner, but in such a period of enormous social difficulty this difference in treatment can not and must not be accepted", the union said. "The owners should invest in vehicle models that guarantee the future of thousands of people rather than enriching only one".